1/*
  2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
  3 * See LICENSE file for license details.
  4 */
  5
  6#include "dwm.h"
  7
  8#include <errno.h>
  9#include <stdio.h>
 10#include <stdlib.h>
 11#include <string.h>
 12#include <unistd.h>
 13#include <sys/select.h>
 14#include <X11/cursorfont.h>
 15#include <X11/Xatom.h>
 16#include <X11/Xproto.h>
 17
 18
 19/* static */
 20
 21static int (*xerrorxlib)(Display *, XErrorEvent *);
 22static Bool otherwm;
 23
 24static void
 25cleanup()
 26{
 27	while(sel) {
 28		resize(sel, True, TopLeft);
 29		unmanage(sel);
 30	}
 31	XSetInputFocus(dpy, PointerRoot, RevertToPointerRoot, CurrentTime);
 32}
 33
 34static void
 35scan()
 36{
 37	unsigned int i, num;
 38	Window *wins, d1, d2;
 39	XWindowAttributes wa;
 40
 41	if(XQueryTree(dpy, root, &d1, &d2, &wins, &num)) {
 42		for(i = 0; i < num; i++) {
 43			if(!XGetWindowAttributes(dpy, wins[i], &wa))
 44				continue;
 45			if(wa.override_redirect || XGetTransientForHint(dpy, wins[i], &d1))
 46				continue;
 47			if(wa.map_state == IsViewable)
 48				manage(wins[i], &wa);
 49		}
 50	}
 51	if(wins)
 52		XFree(wins);
 53}
 54
 55static int
 56win_property(Window w, Atom a, Atom t, long l, unsigned char **prop)
 57{
 58	int status, format;
 59	unsigned long res, extra;
 60	Atom real;
 61
 62	status = XGetWindowProperty(dpy, w, a, 0L, l, False, t, &real, &format,
 63			&res, &extra, prop);
 64
 65	if(status != Success || *prop == 0) {
 66		return 0;
 67	}
 68	if(res == 0) {
 69		free((void *) *prop);
 70	}
 71	return res;
 72}
 73
 74/*
 75 * Startup Error handler to check if another window manager
 76 * is already running.
 77 */
 78static int
 79xerrorstart(Display *dsply, XErrorEvent *ee)
 80{
 81	otherwm = True;
 82	return -1;
 83}
 84
 85/* extern */
 86
 87char stext[1024];
 88int tsel = DEFTAG;
 89int screen, sx, sy, sw, sh, bx, by, bw, bh, mw;
 90Atom wmatom[WMLast], netatom[NetLast];
 91Bool running = True;
 92Bool issel = True;
 93Client *clients = NULL;
 94Client *sel = NULL;
 95Cursor cursor[CurLast];
 96Display *dpy;
 97DC dc = {0};
 98Window root, barwin;
 99
100int
101getproto(Window w)
102{
103	int protos = 0;
104	int i;
105	long res;
106	unsigned char *protocols;
107
108	res = win_property(w, wmatom[WMProtocols], XA_ATOM, 20L, &protocols);
109	if(res <= 0) {
110		return protos;
111	}
112	for(i = 0; i < res; i++) {
113		if(protocols[i] == wmatom[WMDelete])
114			protos |= PROTODELWIN;
115	}
116	free((char *) protocols);
117	return protos;
118}
119
120void
121sendevent(Window w, Atom a, long value)
122{
123	XEvent e;
124
125	e.type = ClientMessage;
126	e.xclient.window = w;
127	e.xclient.message_type = a;
128	e.xclient.format = 32;
129	e.xclient.data.l[0] = value;
130	e.xclient.data.l[1] = CurrentTime;
131	XSendEvent(dpy, w, False, NoEventMask, &e);
132	XSync(dpy, False);
133}
134
135void
136quit(Arg *arg)
137{
138	running = False;
139}
140
141/*
142 * There's no way to check accesses to destroyed windows, thus those cases are
143 * ignored (especially on UnmapNotify's).  Other types of errors call Xlibs
144 * default error handler, which calls exit().
145 */
146int
147xerror(Display *dpy, XErrorEvent *ee)
148{
149	if(ee->error_code == BadWindow
150	|| (ee->request_code == X_SetInputFocus && ee->error_code == BadMatch)
151	|| (ee->request_code == X_PolyText8 && ee->error_code == BadDrawable)
152	|| (ee->request_code == X_PolyFillRectangle && ee->error_code == BadDrawable)
153	|| (ee->request_code == X_PolySegment && ee->error_code == BadDrawable)
154	|| (ee->request_code == X_ConfigureWindow && ee->error_code == BadMatch)
155	|| (ee->request_code == X_GrabKey && ee->error_code == BadAccess))
156		return 0;
157	fprintf(stderr, "dwm: fatal error: request code=%d, error code=%d\n",
158		ee->request_code, ee->error_code);
159	return xerrorxlib(dpy, ee); /* may call exit() */
160}
161
162int
163main(int argc, char *argv[])
164{
165	int i;
166	unsigned int mask;
167	fd_set rd;
168	Window w;
169	XEvent ev;
170	XSetWindowAttributes wa;
171
172	if(argc == 2 && !strncmp("-v", argv[1], 3)) {
173		fputs("dwm-"VERSION", (C)opyright MMVI Anselm R. Garbe\n", stdout);
174		exit(EXIT_SUCCESS);
175	}
176	else if(argc != 1)
177		eprint("usage: dwm [-v]\n");
178
179	dpy = XOpenDisplay(0);
180	if(!dpy)
181		eprint("dwm: cannot connect X server\n");
182
183	screen = DefaultScreen(dpy);
184	root = RootWindow(dpy, screen);
185
186	/* check if another WM is already running */
187	otherwm = False;
188	XSetErrorHandler(xerrorstart);
189	/* this causes an error if some other WM is running */
190	XSelectInput(dpy, root, SubstructureRedirectMask);
191	XSync(dpy, False);
192
193	if(otherwm)
194		eprint("dwm: another window manager is already running\n");
195
196	XSetErrorHandler(NULL);
197	xerrorxlib = XSetErrorHandler(xerror);
198
199	/* init atoms */
200	wmatom[WMProtocols] = XInternAtom(dpy, "WM_PROTOCOLS", False);
201	wmatom[WMDelete] = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
202	netatom[NetSupported] = XInternAtom(dpy, "_NET_SUPPORTED", False);
203	netatom[NetWMName] = XInternAtom(dpy, "_NET_WM_NAME", False);
204	XChangeProperty(dpy, root, netatom[NetSupported], XA_ATOM, 32,
205			PropModeReplace, (unsigned char *) netatom, NetLast);
206
207	/* init cursors */
208	cursor[CurNormal] = XCreateFontCursor(dpy, XC_left_ptr);
209	cursor[CurResize] = XCreateFontCursor(dpy, XC_sizing);
210	cursor[CurMove] = XCreateFontCursor(dpy, XC_fleur);
211
212	grabkeys();
213
214	/* style */
215	dc.bg = getcolor(BGCOLOR);
216	dc.fg = getcolor(FGCOLOR);
217	dc.border = getcolor(BORDERCOLOR);
218	setfont(FONT);
219
220	sx = sy = 0;
221	sw = DisplayWidth(dpy, screen);
222	sh = DisplayHeight(dpy, screen);
223	mw = (sw * MASTERW) / 100;
224
225	wa.override_redirect = 1;
226	wa.background_pixmap = ParentRelative;
227	wa.event_mask = ButtonPressMask | ExposureMask;
228
229	bx = by = 0;
230	bw = sw;
231	dc.h = bh = dc.font.height + 4;
232	barwin = XCreateWindow(dpy, root, bx, by, bw, bh, 0, DefaultDepth(dpy, screen),
233			CopyFromParent, DefaultVisual(dpy, screen),
234			CWOverrideRedirect | CWBackPixmap | CWEventMask, &wa);
235	XDefineCursor(dpy, barwin, cursor[CurNormal]);
236	XMapRaised(dpy, barwin);
237
238	dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
239	dc.gc = XCreateGC(dpy, root, 0, 0);
240	drawstatus();
241
242	issel = XQueryPointer(dpy, root, &w, &w, &i, &i, &i, &i, &mask);
243
244	wa.event_mask = SubstructureRedirectMask | EnterWindowMask | LeaveWindowMask;
245	wa.cursor = cursor[CurNormal];
246	XChangeWindowAttributes(dpy, root, CWEventMask | CWCursor, &wa);
247
248	strcpy(stext, "dwm-"VERSION);
249	scan();
250
251	/* main event loop, reads status text from stdin as well */
252	while(running) {
253		FD_ZERO(&rd);
254		FD_SET(STDIN_FILENO, &rd);
255		FD_SET(ConnectionNumber(dpy), &rd);
256
257		i = select(ConnectionNumber(dpy) + 1, &rd, 0, 0, 0);
258		if(i == -1 && errno == EINTR)
259			continue;
260		if(i < 0)
261			eprint("select failed\n");
262		else if(i > 0) {
263			if(FD_ISSET(ConnectionNumber(dpy), &rd)) {
264				while(XPending(dpy)) {
265					XNextEvent(dpy, &ev);
266					if(handler[ev.type])
267						(handler[ev.type])(&ev); /* call handler */
268				}
269			}
270			if(FD_ISSET(STDIN_FILENO, &rd)) {
271				if(!fgets(stext, sizeof(stext), stdin))
272					break;
273				else 
274					stext[strlen(stext) - 1] = 0;
275				drawstatus();
276			}
277		}
278	}
279
280	cleanup();
281	XCloseDisplay(dpy);
282
283	return 0;
284}